Furnace-regulator.



O. BAGLEY.

FURNACE REGULATOR.

APPLICATION FILED JULY 21. 1916.

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CRIN BAGLEY, or WALTHAM, MASSACHUSETTS.

FURNACE-REGULATOR.

Specification of Letters Patent.

Patented Jan. 7, 1919.

Application filed July 21, 1916. Serial No. 110,440.

To an whom it may concern I Be it known that I, OnIN BAGLEY, a citi zen of the United States, residing at Waltham, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Furnace-Regulators, of which the following is a specification.

The present invention relates to means for regulating the draft in furnaces by opening and closing the air admission doors wholly or in part. Such doors are usually the doors which open into the ash pit of the furnace and will be termed ash pit doors in this specification for convenience of description. The invention comprises the combination with any sort of motor adapted to be operated by changes in heat or temperature, of a novel and improved means for causing said motor to open and close the ash pit door or doors of the furnace. More particularly the invention comprises a connection for applying the motive power of an actuator to a furnace door, constructed and arranged so that it may positively open and close such door against material resistance, such as that which is offered by the latch and'hook commonly provided on furnace doors. A desirable embodiment of the invention is shown in the drawings hereto annexed in Which- Figure 1 represents the front elevation of a boiler having a double set of doors, with the appliance in which my invention is embodied connected thereto.

Fig. 2 is a plan view of parts below the line 2-2 in Fig. 1, showing a portion of the front wall of the furnace in section.

Fig. 3 is a similar view which differs from Fig. 2 only in showing the open position of the doors and the corresponding'positions of the operating parts, the showing in Fig. 2- representing the ash pit doors as closed. 7 r i r Fig. 4 is a detail sectional View on line 41.4 of Fig. 2.

Fig. 5 is a sectional view on line 5 5 of Fig. 2; t

In the drawings 6 represents a boiler, 7 the casing surrounding the boiler, 8, 9 the fire'doors and 11, 12 the ash pit doors. The latter doors serve also to admit air for supporting combustion, when opened, and to regulate the draft and rate of combustion of the fuel in the furnace, according to their p ition and the'degree to which they are opened. In effect they are air admitting doors or means, and the term ash pit doors, which is used throughout the following specification, is to be understood as including any type of door wherever located. and also any means of any sort for admitting air to support combustion. In other words the descriptive term ash pit doors is used merely forconvenience and without limiting significance.

The furnace as shown is a double one with two sets of doors, but the invention is equally applicable to a furnace having only one set of doors, or to one having more than two doors of each sort. On top of the furnace casing is mounted a regulator 13 consisting of a flexible diaphragm 14 which forms the movable wall of a pressure cham ber 15., a follower 16, and a transmission lever 17 The follower 16 bears upon the diaphragm and transmits movement to the lever when the diaphragm is bulged outwardly by pressure in the chamber 15. Steam for operating the motor is furnished from the boiler by a pipe 18 to the pressure chamber through a passage 19. I do not restrict my invention to the motor shown, which is not my invention and is not novel, but include within the scope of those of my claims which recite a motor, any kind of apparatus operable by pressure or temper ature changes and adapted to move and regulate dampers or other air admitting and excluding means.

A chain 20 hangs connected to one end of a helical spring 21, the other end of which is attached to the fixed abutment 22 on the front wall of the furnacebase. The spring exerts a constant downward pull on the chain and is stretched when the lever is raised, keeping the chain taut at all times and exerting'a sufliciently powerful pull on the chain when the lever is lowered, to enable the chain to do work.

The chain ispositively engaged with the teeth of a sprocket wheel 23 mounted on a shaft 241 which is journaled partly in the furnace base and partly in a case 25 attached to the base at a distance therefrom. Guide wheels 23*, 23 preferably also made of sprocket wheel construction or formation,

are located above and below the wheel 23 in an overlapping relation thereto so as to bend the chain partly around the wheel 23 far enough to aifo'rd security against accidental slipping'Qfi In addition guides 23 and 23 from the lever 17 and is are provided above the guide wheel 23 and below the guide wheel 23 to guide the chain into a plane which is parallel to the axes of these wheels, preventing the chain from becoming so far twisted as possibly to slip ofi from either of the guide wheels. The sprocket wheel lies between the front wall of the base and the case 25 as shown in Figs. 2 and 3. On the shaft 24 and in the case 25 is a pinion 26 meshing with racks 27 and 28 which lie on opposite sides of the pinion in approximate parallelism with one another and pass through the end walls of the case 25. They are guided by rolls 29, 29, 30, 30, respectively to maintain their mesh with the pinion. The ends of the rack bars extend out from the casing and are connected with the ash pit doors, the rack bar 27 being connected through a link 31' with the door 12, and the bar 28 being connected by a link 32 with the door 11.

The connection between the links and doors is made mediately by means of levers 33, 34, respectively pivoted on pins 35, 36 carried by lugs 37, 38 on the doors with which they are respectively connected. The two levers 33, 34 are essentially alike, differing only in that one is reversed in position with respect to the other because the doors here shown are hung on relatively opposite sides, and both work in the same manner. Each lever carries on its end next to the furnace wall an anti-friction roll 39, and on the furnace wall adjacent to each of the rolls is a hook or abutment 40 which has an outwardly projecting inclined guide portion 41. Such hook or abutment with its guide portion may be made of any material and applied to the furnace in any desired manner so that its relationto the lever carried by the door is substantially that shown and hereinafter more particularly described.

When the ash pit door is fully closed the roll 39 lies between the furnace wall and the hook 40, the distance to which the hook projects being sufficient to provide a pocket in which the roll may enter with very little play. The roll is caused to enter such pocket and the lever 33, and correspondingly lever 34, caused to occupy the inclined'position shown in Fig. 2, by the action of the chain 20 through the sprocket wheel 23, shaft 24-, pinion 26, rack bars 27, 2'8 and links 31, 32. In this position-of the doors the latch noses 42,:when the doors are provided with such noses, are engaged with the-hooks 43 usually mounted on the front face of the furnace and provided for the purpose of securing the doors in closed position. 7

The operation of-the apparatus is as follows: VVhen the pressure in the boiler, or the temperature of the fluiclcontrolled regulator, drops below the limit for which the apparatus is set (it being assumed that the ash pit doors are closed), the controller allows the arm 17 to descend, thereby per Initting the spring 21 to move the chain 20 endwise and thereby rotate the shaft 24 in the direction which causes the rack bar 27 to be moved to the right and the bar 28 to the left. These movements of the rack bars being transmitted through the links 31 and 32 swing the levers 33 and 34 from the in clined position shown in Fig. 2 to perpen- I dicular relation with the, furnace wall. Thereby the inner ends of the levers, or rather the rolls 39 mounted on such ends, are pressed against the furnace wall, with the effect of exerting a powerful outward pressure against the pivots 35 and 36, thereby prying or crowding the doors away from the furnace wall and releasing the latches 42 from the hooks 43. The force thus exerted is evidently a powerful one since it is essentially that of a toggle, the levers moving.

both doors, which becomes tight when the doors have reached substantially the position shown in Fig. 3, but such chain may be omitted if desired.

hen the steam pressure, or the temperature to be regulated rises, the reverse move- The extent of opening ofthe ment of the lever 17 and chain 20 occurs 7 and the rack bars and links are moved in the opposite directions respectively,thereb-y swinging the doors toward closed position. In this movement the rolls 39 travel; along the guides 41 until. they pass the abutments 40. Said guides are provided for the purpose of thus conducting the rolls into the spaces between the abutments and the furnace wall, and are extended far enough from the furnace wall and such angles thereto as to accomplish this purpose. In passing over the ends of the abutn'ients 40 the rolls 39 are pressed voutwardly against the same by the movem'entof the levers 33, 34 about their pivots, and such rolls thereby'become the fulcrum points of the levers, which apply force through their pivots to the doors, forcing them tightly shut, and forcing the latches into engagement with the books 43, in case the furnace is provided with such hooks. V 7

Both doors are actuated in-the same way atthe same time. that either door maybe omitted and the apparatus applied to the controlling of one door alone. It is equally apparent that the operativeness of the invention is not affected It is therefore evident r duplicates or equivalents of the levers 33 and 34. In cases where one of the doors of'the in any way by the locationof the doors, wherefore it may be applied to the furnace doors for the purpose of checking the fire instead of to the ash pit doors for the-purpose already set forth. Equally well also may the same controlling appliance beconnected to operatethe doors of a second 'furnace at the same time, and thereforeI have shown in Fig. 1 means for operatlng-the doors of an adJacent furnacegsuch means comprising links 47 and 48 similar to the links 3] and 32 and connected to the opposite ends from the latter links of the rack bars 27 and '28, respectively; such links, it is understood being connected to other doors by above described by shifting thefohainQO so that :it willengage the opposite side of'the ratchet wheel 23 from-that with which it is here shown as being engaged" My essential invention resides in theracks,

. toggle levers andtheir connections, orthe equivalents thereof. vSuch part of the invention as involves the combination with the pressure or temperature operated controller or controlling motoryis fulfilledby theemployment with the rest of the combination perpendicular to the plane of the door,

illustrated. In the following claims the termftdamper? including anyxdraft of any sort of controller capable ofibeing applied for the purpose described, whether such controller is like or unlike that here may be considered as regulating means and including a door, such as the ash plt door or the fire door, which serves the purpose of a damper by being closed or opened to varying degrees.

What I claim and desire to secure by Letters Patent is:

1. In a furnace regulator, a door hinged to the furnace, a lever carried by the door arranged to move in a plane substantiallg an so to bear on the wall of the furnace as to apply a crowding pressure for opening the door when the latter is closedand having an arm extending at the same time away from said wall, an abutment spaced away from the furnace wall for engagingsaid lever to receive the thrust of the latter in fully closing the door, a controller, and an endwise movable link connected to said arm for applying movement tending to swing said lever in one direction or the other in consequence of movements of said controller.

2. In a furnace, a hinged damper adapted to be opened and closed, a lever pivoted on said damper to turn in a plane substantially perpendicular to the hinge axis of the damper, having one armnbearing on the furnace atan inclination to the plane of the damper when the latter is closed and a-sec- 0nd arm projecting outwardly from the damper, said lever being movable relatively to the damper into a positionwherein said first arm .is substantially perpendicular to said plane,-a stop-on the damper for limiting SUCll IGlSLlZlVB movement, a rack mounted and movable in .a line substantially parallel to the plane of the closed position of the damper, a motor. geared to move said rack in accordance with the demand for heat from the furnace, and a connecting link from the rack to thesecond lever arm for transmitting motion from the rack to said arm and'thence to the damper,

8. An automatic apparatus for opemngv thedoor of a furnace comprising in ;co mbi nation with suchdoor, a lever plvoted to the door and arranged to occupy an inclined relation to thevface ofthe furnace with its inner end in contact with such face whenthe door is closed, a link connected to. the outer end ofsaid lever, and a controller geared to said link for moving the same ina direction which tends to move said leverinto the perpendicular; relation to the furnace ,wall. 4.'The combination witha wall, a door covering an opening in said wall,and alatch for retaining the door in 1closed-position, of controlling mechanism, includinga rod or bar guided to move: approximately parallel to saidwall, and a lever pivoted to the door to turn about an axis; approximately parallel to the door and having an outwardlypro jecting arm connected to said rod or bar and an inwardly projectingiarm,-:and .an abutment spaced apart from'the wall sufiiciently to receive the end of said inwardly projecting lever arm; the latter, when the door is closed, being inclined to the Wall and entering the space between the same and said abutment.

5. A furnace regulator comprising a hinged damper adapted to be opened and closed, a lever mounted on said damper with provision for turning thereon, the furnace having abutments with a space between them into which one arm of the lever enters when the damper is closed, said arm being then at an inclination to the plane of the damper, said lever having a second arm,and controlling means for the damper connected to said second arm and arranged to exert force thereonin a line at one side of the hinge axis of the damper and at the same time in a direction transverse to the said second arm of said lever and to the pivot axis of the latter, whereby said controlling means is operative toturn the lever so as to act against one of said abutments in opening orclosing the damper, and also to apply force to the damper for moving it toward and away from the closed position.

6. A furnace regulator comprisinga mov able damper, a motion applying lever pivoted to said damper'to move transversely of the plane of the damper, abutments for one end of said lever, and power applying means connected to the other end of said lever, said lever being forced against one of said abutments When moved in one direction and thereby closing the damper and being forced against the other abutment and thereby the damper is closed, said lever being then at an inclination to the direction in which the damper moves in being opened but in the same plane with the line of such direction, and means connected to the other arm of said lever for moving the same.

8) A furnace regulator comprising a movable damper, an operating lever pivoted to 'said damper, complemental abutments arranged to receive one end of said lever between them when the damper is closed, said lever being then at an inclination to the direction in which the damper moves in being opened, one of said abutment's' having an outwardly extending guide to conduct the said lever past the same and to the space between the abutments, and means connected to the other arm of said lever for mov ng the same. Y

9; The combination with a furnace of a movable damper, abutments connected with 'thefurnace having a space between them, a

lever pivoted upon the damper having an arm arranged to enter. such space when the damper is closed, being then at an inclinal0. The'combination with a furnace of a.

door, an abutment spaced apart from the face of the furnace and having an outwardly extending guide portion, a lever pivoted to said door arranged with one arm extending between said abutment: and the face of the furnace and at an inclination to the latter when the door is closed, a link connected to the other arm of said lever and means for moving said link endwise in one direction or the other according to changes in tempera ture conditionrequiring a shift in the position of the door, and a stop on said door toward which one arm of the lever moves when the lever is approaching perpendicularrelation to the face .of the furnace.

In testimony whereof I have affixed my signature. I Y 1 ORIN'BAGLEY;

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' washingtoig l). G. 

